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The prime mover for flexion of the shoulder muscles used are the following: 1  Pectoralis Major Clavicle. 2  Anterior Deltoid. 3  Biceps Brachii Short Head. 4  Coracobrachialis.
The deltoid muscle is involved in rotating the shoulder. The deltoid muscle is responsible for the shoulder's rounded shape. The military press strengthens the deltoids, or shoulders muscles, and other muscles of the upper body. Deltoid muscles contain three parts: posterior, anterior and lateral. View slideshow of images above.